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kaochenlong/gist:2375055

Created April 13, 2012 08:16
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gistfile1.rb
def get_combinations(n, m)
combinations = []
(0..n-1).to_a.combination(m) do |c|
array = Array.new(n, 0)
c.each { |i| array[i] = 1 }
combinations << array.join
end
combinations
end
# 5取3
p get_combinations 5, 3
# 得到結果 ["11100", "11010", "11001", "10110", "10101", "10011", "01110", "01101", "01011", "00111"]
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